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/* |
/* |
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rdesktop: A Remote Desktop Protocol client. |
rdesktop: A Remote Desktop Protocol client. |
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Bitmap decompression routines |
Bitmap decompression routines |
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Copyright (C) Matthew Chapman 1999-2000 |
Copyright (C) Matthew Chapman 1999-2001 |
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This program is free software; you can redistribute it and/or modify |
This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
it under the terms of the GNU General Public License as published by |
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#include "rdesktop.h" |
#include "rdesktop.h" |
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#define CVAL(p) (*(p++)) |
#define CVAL(p) (*(p++)) |
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#define SVAL(p) ((*((p++) + 1) << 8) | CVAL(p)) |
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#define REPEAT(statement) { while ((count > 0) && (x < width)) { statement; count--; x++; } } |
#define UNROLL8(exp) { exp exp exp exp exp exp exp exp } |
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#define MASK_UPDATE() { mixmask <<= 1; if (mixmask == 0) { mask = CVAL(input); mixmask = 1; } } |
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BOOL bitmap_decompress(unsigned char *output, int width, int height, |
#define REPEAT(statement) \ |
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unsigned char *input, int size) |
{ \ |
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while((count & ~0x7) && ((x+8) < width)) \ |
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UNROLL8( statement; count--; x++; ); \ |
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\ |
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while((count > 0) && (x < width)) { statement; count--; x++; } \ |
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} |
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#define MASK_UPDATE() \ |
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{ \ |
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mixmask <<= 1; \ |
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if (mixmask == 0) \ |
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{ \ |
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mask = fom_mask ? fom_mask : CVAL(input); \ |
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mixmask = 1; \ |
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} \ |
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} |
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BOOL |
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bitmap_decompress(unsigned char *output, int width, int height, |
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unsigned char *input, int size) |
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{ |
{ |
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unsigned char *end = input + size; |
unsigned char *end = input + size; |
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unsigned char *prevline = NULL, *line = NULL; |
unsigned char *prevline = NULL, *line = NULL; |
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int lastopcode = -1, insertmix = False, bicolour = False; |
int lastopcode = -1, insertmix = False, bicolour = False; |
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uint8 code, colour1 = 0, colour2 = 0; |
uint8 code, colour1 = 0, colour2 = 0; |
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uint8 mixmask, mask = 0, mix = 0xff; |
uint8 mixmask, mask = 0, mix = 0xff; |
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int fom_mask = 0; |
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while (input < end) |
while (input < end) |
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{ |
{ |
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fom_mask = 0; |
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code = CVAL(input); |
code = CVAL(input); |
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opcode = code >> 4; |
opcode = code >> 4; |
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case 0xf: |
case 0xf: |
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opcode = code & 0xf; |
opcode = code & 0xf; |
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count = (opcode < 13) ? SVAL(input) : 1; |
if (opcode < 9) |
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{ |
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count = CVAL(input); |
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count |= CVAL(input) << 8; |
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} |
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else |
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{ |
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count = (opcode < 0xb) ? 8 : 1; |
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} |
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offset = 0; |
offset = 0; |
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break; |
break; |
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} |
} |
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/* Read preliminary data */ |
/* Read preliminary data */ |
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mixmask = 0; |
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switch (opcode) |
switch (opcode) |
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{ |
{ |
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case 0: /* Fill */ |
case 0: /* Fill */ |
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mix = CVAL(input); |
mix = CVAL(input); |
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opcode -= 5; |
opcode -= 5; |
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break; |
break; |
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case 9: /* FillOrMix_1 */ |
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mask = 0x03; |
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opcode = 0x02; |
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fom_mask = 3; |
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break; |
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case 0x0a: /* FillOrMix_2 */ |
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mask = 0x05; |
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opcode = 0x02; |
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fom_mask = 5; |
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break; |
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} |
} |
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lastopcode = opcode; |
lastopcode = opcode; |
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mixmask = 0; |
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/* Output body */ |
/* Output body */ |
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while (count > 0) |
while (count > 0) |
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); |
); |
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break; |
break; |
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case 13: /* White */ |
case 0xd: /* White */ |
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REPEAT(line[x] = 0xff); |
REPEAT(line[x] = 0xff); |
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break; |
break; |
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case 14: /* Black */ |
case 0xe: /* Black */ |
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REPEAT(line[x] = 0x00); |
REPEAT(line[x] = 0x00); |
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break; |
break; |
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default: |
default: |
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NOTIMP("bitmap opcode 0x%x\n", |
unimpl("bitmap opcode 0x%x\n", |
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opcode); |
opcode); |
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return False; |
return False; |
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} |
} |